harborfreight.com will have one of the super-cheap benders, but I'd never use that on a rollbar. It might work on your other projects though. I used 2" x .120" wall tubing, but many guys seem to use the 1.75" or 1.5" stuff. I'll probably use 1.5" for the rest of my cage when I get around to it. For the small amount of bending I needed, it was worthwhile to seek out someone who already owned a bender.
Jeep on!
--Pete